Matruf bin Tarayf al-Harithi مطرف بن طريف · The Book of Fasting

"You should take Sahur for it is the blessed breakfast."

"The Messenger of Allah said: 'Fasting is a shield."

"My father got me married to a woman and he came to visit her and said: 'What do you think of your husband?' She said: 'What a wonderful man he is. He does not sleep at night and he does not break his fast during the day.' He got upset with me and said: 'I got you married to a woman from among the Muslims and you have neglected her.' I did not pay attention to what he said because…

"I will certainly stand all night (in prayer) and fast every day for as long as I live." The Messenger of Allah said: "Are you the one who said that?" I said: 'I said it, O Messenger of Allah.' The Messenger of Allah said: 'You cannot do that. Fast and break your fast, sleep and stand (in prayer), and fast three days of each month. For a good deed is equal to ten like it, and that is like fasting…

"The Messenger of Allah commanded me to pray two Rakahs of Duah,nt to sleep until after praying Witr and to fast three days of each month. (Sahih).